A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

What has lots of eyes, but can’t see?

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

Prove that twice of ten is the same as twice of eleven.

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?